Experiments were performed to investigate the conjugate forced convection–conduction cooling of a protruding heater mounted on the lower wall (substrate plate) of a rectangular duct. The heater was an aluminum rectangular block heated by means of electric power dissipation in an embedded resistance....

Experiments were performed to investigate the conjugate forced convection–conduction cooling of a protruding heater mounted on the lower wall (substrate plate) of a rectangular duct. The heater was an aluminum rectangular block heated by means of electric power dissipation in an embedded resistance. Airflow was forced in the duct with a hydraulic diameter Reynolds number in the range from 2,000 to 6,000. Effects of the substrate plate thermal conductivity on the heater conjugate cooling were obtained from measurements with two distinct substrates: a Plexiglas plate and an aluminum plate. The experimental results for the heater conjugate cooling were described by a single dimensionless conjugate coefficient expressed as a function of the Reynolds number. The results also indicated that the conjugate coefficient is invariant with the heater power dissipation. In addition, the heater direct convective loss to the airflow was also evaluated and described by another invariant descriptor, the adiabatic Nusselt number, as a function of the duct Reynolds number

COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES

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